Chapter 8 Quiz

Question 1

When should a program explicitly use the this reference?

Answer 1

Accessing a field that is shadowed by a local variable

Question 2

A static class variables:

are public
are private
are shared by all objects of a class
cannot be accessed by any instance of the class

Answer 2

are shared by all objects of a class

Question 3

The import declaration import *; ________.

Answer 3

causes a compilation error

Question 4

When no access modifier is specified for a method or variable, the method or variable:

Answer 4

can be accessed by any program in its package

Question 5

A class within a package must be declared public if

Answer 5

It will be used by classes that are not in the same package

Question 6

T or F

A package is a group of nested classes and interfaces

Answer 6

True

Question 7

T or F

A package is a directory structure used to organize classes and interfaces.

Answer 7

True

Question 8

T or F

Packages make it more difficult to reuse code

Answer 8

False

Question 9

T or F

The garbage collector reclaims unused memory

Answer 9

True

Question 10

T or F

The method finalize takes parameters

Answer 10

False

Question 11

T or F

The method finalize uses a return type of void

Answer 11

True

Question 12

What does the this method do

Answer 12

It allows an object to reference itself

Question 13

In a class definition should a default constructor be declared private? Why or Why not?

Answer 13

A constructor should never be a private method as it would prevent the object from being instantiated.

Question 14

What does declaring an instance variable final do?

Answer 14

Declaring an instance variable final means that the variable has a constant value that cannot be modified.

Question 15

Imports all static members of a class

Answer 15

static import on demand

Question 16

String class static method ______________ is similar to method System.out.printf, but return a formatted String rather than displaying a String in a command window.

Answer 16

format

Question 17

A method contains a local variable with the same name as one of it’s class fields, t he local variable is said to _______ the scope of the method’s scope.

Answer 17

Shadow

Question 18

The public methods of a class are known as

Answer 18

Public Interfaces or Public Services

Question 19

A(n) ________________ method is called implicitly when the objects appears in code where String is needed

Answer 19

ToString();

Question 20

A(n) _______________ declaration specifies one class to import.

Answer 20

single-type-import

Question 21

If a class declares constructors, the complier will not create a(n) ___________________

Answer 21

default constructor

Question 22

Get methods are commonly called

Answer 22

accessors methods or query methods

Question 23

If a class declares a constructor the complier will not create

Answer 23

a default constructor

Question 24

A ____________ method tests whether a condition is true or false

Answer 24

predicate